The boy said ________ couldn't he work out the problem but his teacher didn't know how to do it.
Left ____ in the reading room alone quite by accident, the boy felt nervous.
I _____ to my cousin’s birthday party last night, but I was not available.
It was a pity that the policeman failed to find such a person ____ had beendescribed by the witness.
Focused on, in my opinion, ____ your heart asks you to do, you will realize your dream one day. A. that B what C. which D. how
---- Mary, correct the mistakes in your homework, will you?---- _____.